JWT Decoder - Free Online Tool

Tool Vera Lab Team

JWT Decoder

Decode and inspect JSON Web Tokens directly in your browser. View the JWT header, payload, and important token information.

``` ```
```
Token Parts -
Issued At -
Expiration -
Header 
{}
Payload 
{}
Signature 




```

  


  


```
Security Notice:
JWT decoding does not verify the token's signature.
Never paste passwords, private keys, or sensitive production tokens
into an online tool unless you understand the security implications.
```

  











  
About JWT Decoder


  

    JWT Decoder is a free online tool designed to help
    developers inspect and decode JSON Web Tokens (JWT) directly in their
    browser.
  


  

    A JSON Web Token is commonly used for authentication and authorization
    in modern web applications and APIs. A JWT normally contains three
    parts: a header, a payload, and a signature.
  


  
What Can JWT Decoder Do?


  
    

```

  • 
  Decode the JWT header and display it in a readable JSON format.

    • 


  • 
  Decode the JWT payload and display its claims clearly.

    • 


  • 
  Detect common token information such as issued-at and expiration times.

    • 


  • 
  Display the encoded signature portion of the token.

    • 


  • 
  Copy the decoded header or payload with one click.

    • 


  • 
  Run completely in the browser without requiring a server-side JWT
  decoding service.

    • 
```

  


  
How to Decode a JWT


  
    

```

  1. 
  Copy your JWT token from your application, API response, or
  development environment.

    2. 


  2. 
  Paste the token into the input box.

    3. 


  3. 
  Click Decode JWT.

    4. 


  4. 
  Review the decoded header, payload, signature, and available
  timestamp information.

    5. 


  5. 
  Use the copy buttons if you need the decoded JSON elsewhere.

    6. 
```

  


  
Common JWT Claims


  
    

```

  • 
  iss:
  Identifies the issuer of the token.

    • 


  • 
  sub:
  Identifies the subject of the token.

    • 


  • 
  aud:
  Identifies the intended audience.

    • 


  • 
  exp:
  Defines the token expiration time.

    • 


  • 
  iat:
  Defines when the token was issued.

    • 


  • 
  nbf:
  Defines the time before which the token should not be accepted.

    • 


  • 
  jti:
  Provides a unique identifier for the token when supplied.

    • 
```

  


  
Frequently Asked Questions


  


```


  What is a JWT?

  JWT stands for JSON Web Token. It is a compact token format commonly
  used to securely transfer claims between parties and is widely used
  for authentication and API authorization.





  Can this tool verify a JWT?

  No. This tool decodes the readable parts of a JWT but does not verify
  the cryptographic signature. Signature verification requires the
  appropriate secret key or public key and a proper verification process.





  Does decoding a JWT reveal the original password?

  A properly implemented JWT should not contain passwords or other
  secrets. Decoding only converts the Base64URL-encoded header and
  payload into readable data; it does not decrypt encrypted information.





  Is JWT Decoder free?

  Yes. The tool is designed to decode JWT tokens directly in the
  browser without requiring a paid service.





  Does the tool send my JWT to a server?

  The decoder is designed to process the token locally in the browser.
  However, users should still avoid entering highly sensitive production
  credentials or tokens into any online tool.





  Why does my JWT show an error?

  The token may be incomplete, incorrectly copied, contain invalid
  Base64URL data, or not follow the standard three-part JWT structure.





  What are the three parts of a JWT?

  A standard signed JWT contains a header, a payload, and a signature.
  These parts are separated by two periods.





  Is a JWT encrypted?

  A normal signed JWT is encoded and signed, not encrypted. Its header
  and payload can therefore be decoded. Encrypted JWTs use different
  mechanisms and cannot simply be read by decoding Base64URL data.


```

  


  


```
Important:
Decoding a JWT is not the same as validating it. A decoded token may
contain claims that should not be trusted until its signature,
issuer, audience, expiration, and other application-specific rules
have been properly verified.
```

  



























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